package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 实现自动填充的切面类
 *
 * @Author mr.zhang
 * Date 2025/5/23 20:05
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointcut(){}

    /**
     * 前置通知
     */
    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行自动填充.....");

        //1.获取到当前被拦截的方法的数据库操作类型
        //1.1获取方法签名对象,并强转为MethodSignature类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //1.2获取方法上的注解对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        //1.3获取数据库操作类型
        OperationType operationType = autoFill.value();

        //2.获取当前被拦截的方法的参数
        Object[] args = joinPoint.getArgs();
        if(args==null || args.length==0){
            return;
        }
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前不同的操作类型,为对应的属性通过反射来赋值
        if(operationType == OperationType.INSERT){
            try {
                //为四个公共字段赋值
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if (operationType == OperationType.UPDATE){
            //为两个公共字段赋值

            try {
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);

                //通过反射为对象属性赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }
}
